labroid t1_j114f3e wrote
Reply to comment by Game_Minds in Could being submersed in a sealed tank of fluid help humans survive heavy G acceleration in outer space? by cheeze_whiz_shampoo
The person displaces their weight in water - that's the "on Earth" definition. The more general definition is they displace their mass. Their weight is m * a and the water they displace is rho * V * a (rho is density, V is volume, and a is acceleration). Where you float is therefore
m * a = rho * V * a
So you cancel the a on both sides and get
m = rho * V
(for fun note that rho * V is the mass of the water). So the general form of buoyancy is that you float where you displace your mass in water. Note this is completely independent on acceleration (g's). So the person will stay in the same position, unless compressed by the extra pressure of the pool, at which point they will "sink" (move in the direction of the acceleration vector). Of course getting compressed is the "then you die" part of the problem...
Game_Minds t1_j120vu3 wrote
The fluids in a person's body have different densities at a given pressure
It would be like putting you in a centrifuge, some of your parts like your bones would have different buoyancy than others and would experience pressure to separate out
It would be significantly less pressure than other forces acting on you and it might be too small to overcome the forces your body exerts
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